Logic to determine new listings

[JustinDrake]

When you go to Duo Search right now, we show the latest listings. This was possible with OB1.0 because each listing had a unique GUID, and kept that GUID across edits.

With the current OB2.0 setup, this is not so easy. As discussed during a technical call with @hoffmabc and @cpacia, my suggestion is to have versioning at the listing level by including a previousEditHash field containing the hash of the previous version of the listing. When a listing is created the first time, previousEditHash would be the empty string and could deemed "new" for display on Duo Search.

Listing versioning is also helpful for ratings, as discussed here.

[cpacia]

slugs are more or less kept across edits.

[JustinDrake]

Vendors will want to edit their slug to make URIs prettier, and to make the URIs match with an edited title. I don't think slugs works well for this.

[placer14]

@cpacia Can we close this?